1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 1992, 1993, 1994, 1995
4 * Remy Card (card@masi.ibp.fr)
5 * Laboratoire MASI - Institut Blaise Pascal
6 * Universite Pierre et Marie Curie (Paris VI)
10 * linux/include/linux/minix_fs.h
12 * Copyright (C) 1991, 1992 Linus Torvalds
15 #include <linux/ext2_fs.h>
16 #include <linux/blockgroup_lock.h>
17 #include <linux/percpu_counter.h>
18 #include <linux/rbtree.h>
20 #include <linux/highmem.h>
22 /* XXX Here for now... not interested in restructing headers JUST now */
24 /* data type for block offset of block group */
25 typedef int ext2_grpblk_t
;
27 /* data type for filesystem-wide blocks number */
28 typedef unsigned long ext2_fsblk_t
;
32 struct ext2_reserve_window
{
33 ext2_fsblk_t _rsv_start
; /* First byte reserved */
34 ext2_fsblk_t _rsv_end
; /* Last byte reserved or 0 */
37 struct ext2_reserve_window_node
{
38 struct rb_node rsv_node
;
41 struct ext2_reserve_window rsv_window
;
44 struct ext2_block_alloc_info
{
45 /* information about reservation window */
46 struct ext2_reserve_window_node rsv_window_node
;
48 * was i_next_alloc_block in ext2_inode_info
49 * is the logical (file-relative) number of the
50 * most-recently-allocated block in this file.
51 * We use this for detecting linearly ascending allocation requests.
53 __u32 last_alloc_logical_block
;
55 * Was i_next_alloc_goal in ext2_inode_info
56 * is the *physical* companion to i_next_alloc_block.
57 * it is the physical block number of the block which was most-recently
58 * allocated to this file. This gives us the goal (target) for the next
59 * allocation when we detect linearly ascending requests.
61 ext2_fsblk_t last_alloc_physical_block
;
64 #define rsv_start rsv_window._rsv_start
65 #define rsv_end rsv_window._rsv_end
70 * second extended-fs super-block data in memory
73 unsigned long s_frag_size
; /* Size of a fragment in bytes */
74 unsigned long s_frags_per_block
;/* Number of fragments per block */
75 unsigned long s_inodes_per_block
;/* Number of inodes per block */
76 unsigned long s_frags_per_group
;/* Number of fragments in a group */
77 unsigned long s_blocks_per_group
;/* Number of blocks in a group */
78 unsigned long s_inodes_per_group
;/* Number of inodes in a group */
79 unsigned long s_itb_per_group
; /* Number of inode table blocks per group */
80 unsigned long s_gdb_count
; /* Number of group descriptor blocks */
81 unsigned long s_desc_per_block
; /* Number of group descriptors per block */
82 unsigned long s_groups_count
; /* Number of groups in the fs */
83 unsigned long s_overhead_last
; /* Last calculated overhead */
84 unsigned long s_blocks_last
; /* Last seen block count */
85 struct buffer_head
* s_sbh
; /* Buffer containing the super block */
86 struct ext2_super_block
* s_es
; /* Pointer to the super block in the buffer */
87 struct buffer_head
** s_group_desc
;
88 unsigned long s_mount_opt
;
89 unsigned long s_sb_block
;
92 unsigned short s_mount_state
;
94 int s_addr_per_block_bits
;
95 int s_desc_per_block_bits
;
98 spinlock_t s_next_gen_lock
;
99 u32 s_next_generation
;
100 unsigned long s_dir_count
;
102 struct percpu_counter s_freeblocks_counter
;
103 struct percpu_counter s_freeinodes_counter
;
104 struct percpu_counter s_dirs_counter
;
105 struct blockgroup_lock
*s_blockgroup_lock
;
106 /* root of the per fs reservation window tree */
107 spinlock_t s_rsv_window_lock
;
108 struct rb_root s_rsv_window_root
;
109 struct ext2_reserve_window_node s_rsv_window_head
;
111 * s_lock protects against concurrent modifications of s_mount_state,
112 * s_blocks_last, s_overhead_last and the content of superblock's
113 * buffer pointed to by sbi->s_es.
115 * Note: It is used in ext2_show_options() to provide a consistent view
116 * of the mount options.
119 struct mb_cache
*s_ea_block_cache
;
120 struct dax_device
*s_daxdev
;
123 static inline spinlock_t
*
124 sb_bgl_lock(struct ext2_sb_info
*sbi
, unsigned int block_group
)
126 return bgl_lock_ptr(sbi
->s_blockgroup_lock
, block_group
);
130 * Define EXT2FS_DEBUG to produce debug messages
135 * Define EXT2_RESERVATION to reserve data blocks for expanding files
137 #define EXT2_DEFAULT_RESERVE_BLOCKS 8
138 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
139 #define EXT2_MAX_RESERVE_BLOCKS 1027
140 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
142 * The second extended file system version
144 #define EXT2FS_DATE "95/08/09"
145 #define EXT2FS_VERSION "0.5b"
151 # define ext2_debug(f, a...) { \
152 printk ("EXT2-fs DEBUG (%s, %d): %s:", \
153 __FILE__, __LINE__, __func__); \
157 # define ext2_debug(f, a...) /**/
161 * Special inode numbers
163 #define EXT2_BAD_INO 1 /* Bad blocks inode */
164 #define EXT2_ROOT_INO 2 /* Root inode */
165 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
166 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
168 /* First non-reserved inode for old ext2 filesystems */
169 #define EXT2_GOOD_OLD_FIRST_INO 11
171 static inline struct ext2_sb_info
*EXT2_SB(struct super_block
*sb
)
173 return sb
->s_fs_info
;
177 * Macro-instructions used to manage several block sizes
179 #define EXT2_MIN_BLOCK_SIZE 1024
180 #define EXT2_MAX_BLOCK_SIZE 4096
181 #define EXT2_MIN_BLOCK_LOG_SIZE 10
182 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
183 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
184 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
185 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
186 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
187 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
190 * Macro-instructions used to manage fragments
192 #define EXT2_MIN_FRAG_SIZE 1024
193 #define EXT2_MAX_FRAG_SIZE 4096
194 #define EXT2_MIN_FRAG_LOG_SIZE 10
195 #define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size)
196 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block)
199 * Structure of a blocks group descriptor
201 struct ext2_group_desc
203 __le32 bg_block_bitmap
; /* Blocks bitmap block */
204 __le32 bg_inode_bitmap
; /* Inodes bitmap block */
205 __le32 bg_inode_table
; /* Inodes table block */
206 __le16 bg_free_blocks_count
; /* Free blocks count */
207 __le16 bg_free_inodes_count
; /* Free inodes count */
208 __le16 bg_used_dirs_count
; /* Directories count */
210 __le32 bg_reserved
[3];
214 * Macro-instructions used to manage group descriptors
216 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
217 #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
218 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
219 #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
222 * Constants relative to the data blocks
224 #define EXT2_NDIR_BLOCKS 12
225 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
226 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
227 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
228 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
231 * Inode flags (GETFLAGS/SETFLAGS)
233 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */
234 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */
235 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */
236 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
237 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
238 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
239 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
240 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
241 /* Reserved for compression usage... */
242 #define EXT2_DIRTY_FL FS_DIRTY_FL
243 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
244 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
245 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
246 /* End compression flags --- maybe not all used */
247 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */
248 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
249 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
250 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
251 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
252 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
253 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
254 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
256 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
257 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
259 /* Flags that should be inherited by new inodes from their parent. */
260 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
261 EXT2_SYNC_FL | EXT2_NODUMP_FL |\
262 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\
263 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
264 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
266 /* Flags that are appropriate for regular files (all but dir-specific ones). */
267 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
269 /* Flags that are appropriate for non-directories/regular files. */
270 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
272 /* Mask out flags that are inappropriate for the given type of inode. */
273 static inline __u32
ext2_mask_flags(umode_t mode
, __u32 flags
)
277 else if (S_ISREG(mode
))
278 return flags
& EXT2_REG_FLMASK
;
280 return flags
& EXT2_OTHER_FLMASK
;
286 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION
287 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION
288 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long)
289 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long)
292 * ioctl commands in 32 bit emulation
294 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION
295 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION
298 * Structure of an inode on the disk
301 __le16 i_mode
; /* File mode */
302 __le16 i_uid
; /* Low 16 bits of Owner Uid */
303 __le32 i_size
; /* Size in bytes */
304 __le32 i_atime
; /* Access time */
305 __le32 i_ctime
; /* Creation time */
306 __le32 i_mtime
; /* Modification time */
307 __le32 i_dtime
; /* Deletion Time */
308 __le16 i_gid
; /* Low 16 bits of Group Id */
309 __le16 i_links_count
; /* Links count */
310 __le32 i_blocks
; /* Blocks count */
311 __le32 i_flags
; /* File flags */
314 __le32 l_i_reserved1
;
317 __le32 h_i_translator
;
320 __le32 m_i_reserved1
;
322 } osd1
; /* OS dependent 1 */
323 __le32 i_block
[EXT2_N_BLOCKS
];/* Pointers to blocks */
324 __le32 i_generation
; /* File version (for NFS) */
325 __le32 i_file_acl
; /* File ACL */
326 __le32 i_dir_acl
; /* Directory ACL */
327 __le32 i_faddr
; /* Fragment address */
330 __u8 l_i_frag
; /* Fragment number */
331 __u8 l_i_fsize
; /* Fragment size */
333 __le16 l_i_uid_high
; /* these 2 fields */
334 __le16 l_i_gid_high
; /* were reserved2[0] */
338 __u8 h_i_frag
; /* Fragment number */
339 __u8 h_i_fsize
; /* Fragment size */
340 __le16 h_i_mode_high
;
346 __u8 m_i_frag
; /* Fragment number */
347 __u8 m_i_fsize
; /* Fragment size */
349 __u32 m_i_reserved2
[2];
351 } osd2
; /* OS dependent 2 */
354 #define i_size_high i_dir_acl
356 #define i_reserved1 osd1.linux1.l_i_reserved1
357 #define i_frag osd2.linux2.l_i_frag
358 #define i_fsize osd2.linux2.l_i_fsize
359 #define i_uid_low i_uid
360 #define i_gid_low i_gid
361 #define i_uid_high osd2.linux2.l_i_uid_high
362 #define i_gid_high osd2.linux2.l_i_gid_high
363 #define i_reserved2 osd2.linux2.l_i_reserved2
368 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
369 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
370 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
375 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */
376 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */
377 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */
378 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
379 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
380 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
381 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
382 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
383 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
384 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
385 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
386 #define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */
387 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
388 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
389 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
390 #define EXT2_MOUNT_DAX 0x100000 /* Direct Access */
393 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
394 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
395 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
398 * Maximal mount counts between two filesystem checks
400 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
401 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
404 * Behaviour when detecting errors
406 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
407 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
408 #define EXT2_ERRORS_PANIC 3 /* Panic */
409 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
412 * Structure of the super block
414 struct ext2_super_block
{
415 __le32 s_inodes_count
; /* Inodes count */
416 __le32 s_blocks_count
; /* Blocks count */
417 __le32 s_r_blocks_count
; /* Reserved blocks count */
418 __le32 s_free_blocks_count
; /* Free blocks count */
419 __le32 s_free_inodes_count
; /* Free inodes count */
420 __le32 s_first_data_block
; /* First Data Block */
421 __le32 s_log_block_size
; /* Block size */
422 __le32 s_log_frag_size
; /* Fragment size */
423 __le32 s_blocks_per_group
; /* # Blocks per group */
424 __le32 s_frags_per_group
; /* # Fragments per group */
425 __le32 s_inodes_per_group
; /* # Inodes per group */
426 __le32 s_mtime
; /* Mount time */
427 __le32 s_wtime
; /* Write time */
428 __le16 s_mnt_count
; /* Mount count */
429 __le16 s_max_mnt_count
; /* Maximal mount count */
430 __le16 s_magic
; /* Magic signature */
431 __le16 s_state
; /* File system state */
432 __le16 s_errors
; /* Behaviour when detecting errors */
433 __le16 s_minor_rev_level
; /* minor revision level */
434 __le32 s_lastcheck
; /* time of last check */
435 __le32 s_checkinterval
; /* max. time between checks */
436 __le32 s_creator_os
; /* OS */
437 __le32 s_rev_level
; /* Revision level */
438 __le16 s_def_resuid
; /* Default uid for reserved blocks */
439 __le16 s_def_resgid
; /* Default gid for reserved blocks */
441 * These fields are for EXT2_DYNAMIC_REV superblocks only.
443 * Note: the difference between the compatible feature set and
444 * the incompatible feature set is that if there is a bit set
445 * in the incompatible feature set that the kernel doesn't
446 * know about, it should refuse to mount the filesystem.
448 * e2fsck's requirements are more strict; if it doesn't know
449 * about a feature in either the compatible or incompatible
450 * feature set, it must abort and not try to meddle with
451 * things it doesn't understand...
453 __le32 s_first_ino
; /* First non-reserved inode */
454 __le16 s_inode_size
; /* size of inode structure */
455 __le16 s_block_group_nr
; /* block group # of this superblock */
456 __le32 s_feature_compat
; /* compatible feature set */
457 __le32 s_feature_incompat
; /* incompatible feature set */
458 __le32 s_feature_ro_compat
; /* readonly-compatible feature set */
459 __u8 s_uuid
[16]; /* 128-bit uuid for volume */
460 char s_volume_name
[16]; /* volume name */
461 char s_last_mounted
[64]; /* directory where last mounted */
462 __le32 s_algorithm_usage_bitmap
; /* For compression */
464 * Performance hints. Directory preallocation should only
465 * happen if the EXT2_COMPAT_PREALLOC flag is on.
467 __u8 s_prealloc_blocks
; /* Nr of blocks to try to preallocate*/
468 __u8 s_prealloc_dir_blocks
; /* Nr to preallocate for dirs */
471 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
473 __u8 s_journal_uuid
[16]; /* uuid of journal superblock */
474 __u32 s_journal_inum
; /* inode number of journal file */
475 __u32 s_journal_dev
; /* device number of journal file */
476 __u32 s_last_orphan
; /* start of list of inodes to delete */
477 __u32 s_hash_seed
[4]; /* HTREE hash seed */
478 __u8 s_def_hash_version
; /* Default hash version to use */
479 __u8 s_reserved_char_pad
;
480 __u16 s_reserved_word_pad
;
481 __le32 s_default_mount_opts
;
482 __le32 s_first_meta_bg
; /* First metablock block group */
483 __u32 s_reserved
[190]; /* Padding to the end of the block */
487 * Codes for operating systems
489 #define EXT2_OS_LINUX 0
490 #define EXT2_OS_HURD 1
491 #define EXT2_OS_MASIX 2
492 #define EXT2_OS_FREEBSD 3
493 #define EXT2_OS_LITES 4
498 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
499 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
501 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
502 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
504 #define EXT2_GOOD_OLD_INODE_SIZE 128
507 * Feature set definitions
510 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
511 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
512 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
513 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
514 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
515 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
516 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \
517 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
518 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
519 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
520 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
521 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
522 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
523 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
524 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
525 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
526 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
527 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
529 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
530 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
531 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
532 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
533 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
534 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
535 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff
537 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
538 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
539 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
540 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
542 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
543 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
544 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
545 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
546 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
547 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
549 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
550 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
551 EXT2_FEATURE_INCOMPAT_META_BG)
552 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
553 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
554 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
555 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
556 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
559 * Default values for user and/or group using reserved blocks
561 #define EXT2_DEF_RESUID 0
562 #define EXT2_DEF_RESGID 0
565 * Default mount options
567 #define EXT2_DEFM_DEBUG 0x0001
568 #define EXT2_DEFM_BSDGROUPS 0x0002
569 #define EXT2_DEFM_XATTR_USER 0x0004
570 #define EXT2_DEFM_ACL 0x0008
571 #define EXT2_DEFM_UID16 0x0010
572 /* Not used by ext2, but reserved for use by ext3 */
573 #define EXT3_DEFM_JMODE 0x0060
574 #define EXT3_DEFM_JMODE_DATA 0x0020
575 #define EXT3_DEFM_JMODE_ORDERED 0x0040
576 #define EXT3_DEFM_JMODE_WBACK 0x0060
579 * Structure of a directory entry
582 struct ext2_dir_entry
{
583 __le32 inode
; /* Inode number */
584 __le16 rec_len
; /* Directory entry length */
585 __le16 name_len
; /* Name length */
586 char name
[]; /* File name, up to EXT2_NAME_LEN */
590 * The new version of the directory entry. Since EXT2 structures are
591 * stored in intel byte order, and the name_len field could never be
592 * bigger than 255 chars, it's safe to reclaim the extra byte for the
595 struct ext2_dir_entry_2
{
596 __le32 inode
; /* Inode number */
597 __le16 rec_len
; /* Directory entry length */
598 __u8 name_len
; /* Name length */
600 char name
[]; /* File name, up to EXT2_NAME_LEN */
604 * EXT2_DIR_PAD defines the directory entries boundaries
606 * NOTE: It must be a multiple of 4
608 #define EXT2_DIR_PAD 4
609 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
610 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
612 #define EXT2_MAX_REC_LEN ((1<<16)-1)
614 static inline void verify_offsets(void)
616 #define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y));
617 A(EXT2_SB_MAGIC_OFFSET
, s_magic
);
618 A(EXT2_SB_BLOCKS_OFFSET
, s_blocks_count
);
619 A(EXT2_SB_BSIZE_OFFSET
, s_log_block_size
);
626 struct ext2_mount_options
{
627 unsigned long s_mount_opt
;
633 * second extended file system inode data in memory
635 struct ext2_inode_info
{
647 * i_block_group is the number of the block group which contains
648 * this file's inode. Constant across the lifetime of the inode,
649 * it is used for making block allocation decisions - we try to
650 * place a file's data blocks near its inode block, and new inodes
651 * near to their parent directory's inode.
655 /* block reservation info */
656 struct ext2_block_alloc_info
*i_block_alloc_info
;
658 __u32 i_dir_start_lookup
;
659 #ifdef CONFIG_EXT2_FS_XATTR
661 * Extended attributes can be read independently of the main file
662 * data. Taking i_mutex even when reading would cause contention
663 * between readers of EAs and writers of regular file data, so
664 * instead we synchronize on xattr_sem when reading or changing
667 struct rw_semaphore xattr_sem
;
669 rwlock_t i_meta_lock
;
672 * truncate_mutex is for serialising ext2_truncate() against
673 * ext2_getblock(). It also protects the internals of the inode's
674 * reservation data structures: ext2_reserve_window and
675 * ext2_reserve_window_node.
677 struct mutex truncate_mutex
;
678 struct inode vfs_inode
;
679 struct list_head i_orphan
; /* unlinked but open inodes */
681 struct dquot
*i_dquot
[MAXQUOTAS
];
686 * Inode dynamic state flags
688 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
692 * Function prototypes
696 * Ok, these declarations are also in <linux/kernel.h> but none of the
697 * ext2 source programs needs to include it so they are duplicated here.
700 static inline struct ext2_inode_info
*EXT2_I(struct inode
*inode
)
702 return container_of(inode
, struct ext2_inode_info
, vfs_inode
);
706 extern int ext2_bg_has_super(struct super_block
*sb
, int group
);
707 extern unsigned long ext2_bg_num_gdb(struct super_block
*sb
, int group
);
708 extern ext2_fsblk_t
ext2_new_block(struct inode
*, unsigned long, int *);
709 extern ext2_fsblk_t
ext2_new_blocks(struct inode
*, unsigned long,
710 unsigned long *, int *);
711 extern int ext2_data_block_valid(struct ext2_sb_info
*sbi
, ext2_fsblk_t start_blk
,
713 extern void ext2_free_blocks (struct inode
*, unsigned long,
715 extern unsigned long ext2_count_free_blocks (struct super_block
*);
716 extern unsigned long ext2_count_dirs (struct super_block
*);
717 extern struct ext2_group_desc
* ext2_get_group_desc(struct super_block
* sb
,
718 unsigned int block_group
,
719 struct buffer_head
** bh
);
720 extern void ext2_discard_reservation (struct inode
*);
721 extern int ext2_should_retry_alloc(struct super_block
*sb
, int *retries
);
722 extern void ext2_init_block_alloc_info(struct inode
*);
723 extern void ext2_rsv_window_add(struct super_block
*sb
, struct ext2_reserve_window_node
*rsv
);
726 extern int ext2_add_link (struct dentry
*, struct inode
*);
727 extern int ext2_inode_by_name(struct inode
*dir
,
728 const struct qstr
*child
, ino_t
*ino
);
729 extern int ext2_make_empty(struct inode
*, struct inode
*);
730 extern struct ext2_dir_entry_2
*ext2_find_entry(struct inode
*, const struct qstr
*,
731 struct page
**, void **res_page_addr
);
732 extern int ext2_delete_entry(struct ext2_dir_entry_2
*dir
, struct page
*page
,
734 extern int ext2_empty_dir (struct inode
*);
735 extern struct ext2_dir_entry_2
*ext2_dotdot(struct inode
*dir
, struct page
**p
, void **pa
);
736 extern void ext2_set_link(struct inode
*, struct ext2_dir_entry_2
*, struct page
*, void *,
737 struct inode
*, int);
738 static inline void ext2_put_page(struct page
*page
, void *page_addr
)
740 kunmap_local(page_addr
);
745 extern struct inode
* ext2_new_inode (struct inode
*, umode_t
, const struct qstr
*);
746 extern void ext2_free_inode (struct inode
*);
747 extern unsigned long ext2_count_free_inodes (struct super_block
*);
748 extern unsigned long ext2_count_free (struct buffer_head
*, unsigned);
751 extern struct inode
*ext2_iget (struct super_block
*, unsigned long);
752 extern int ext2_write_inode (struct inode
*, struct writeback_control
*);
753 extern void ext2_evict_inode(struct inode
*);
754 extern int ext2_get_block(struct inode
*, sector_t
, struct buffer_head
*, int);
755 extern int ext2_setattr (struct user_namespace
*, struct dentry
*, struct iattr
*);
756 extern int ext2_getattr (struct user_namespace
*, const struct path
*,
757 struct kstat
*, u32
, unsigned int);
758 extern void ext2_set_inode_flags(struct inode
*inode
);
759 extern int ext2_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
763 extern int ext2_fileattr_get(struct dentry
*dentry
, struct fileattr
*fa
);
764 extern int ext2_fileattr_set(struct user_namespace
*mnt_userns
,
765 struct dentry
*dentry
, struct fileattr
*fa
);
766 extern long ext2_ioctl(struct file
*, unsigned int, unsigned long);
767 extern long ext2_compat_ioctl(struct file
*, unsigned int, unsigned long);
770 struct dentry
*ext2_get_parent(struct dentry
*child
);
773 extern __printf(3, 4)
774 void ext2_error(struct super_block
*, const char *, const char *, ...);
775 extern __printf(3, 4)
776 void ext2_msg(struct super_block
*, const char *, const char *, ...);
777 extern void ext2_update_dynamic_rev (struct super_block
*sb
);
778 extern void ext2_sync_super(struct super_block
*sb
, struct ext2_super_block
*es
,
782 * Inodes and files operations
786 extern const struct file_operations ext2_dir_operations
;
789 extern int ext2_fsync(struct file
*file
, loff_t start
, loff_t end
,
791 extern const struct inode_operations ext2_file_inode_operations
;
792 extern const struct file_operations ext2_file_operations
;
795 extern void ext2_set_file_ops(struct inode
*inode
);
796 extern const struct address_space_operations ext2_aops
;
797 extern const struct address_space_operations ext2_nobh_aops
;
798 extern const struct iomap_ops ext2_iomap_ops
;
801 extern const struct inode_operations ext2_dir_inode_operations
;
802 extern const struct inode_operations ext2_special_inode_operations
;
805 extern const struct inode_operations ext2_fast_symlink_inode_operations
;
806 extern const struct inode_operations ext2_symlink_inode_operations
;
808 static inline ext2_fsblk_t
809 ext2_group_first_block_no(struct super_block
*sb
, unsigned long group_no
)
811 return group_no
* (ext2_fsblk_t
)EXT2_BLOCKS_PER_GROUP(sb
) +
812 le32_to_cpu(EXT2_SB(sb
)->s_es
->s_first_data_block
);
815 static inline ext2_fsblk_t
816 ext2_group_last_block_no(struct super_block
*sb
, unsigned long group_no
)
818 struct ext2_sb_info
*sbi
= EXT2_SB(sb
);
820 if (group_no
== sbi
->s_groups_count
- 1)
821 return le32_to_cpu(sbi
->s_es
->s_blocks_count
) - 1;
823 return ext2_group_first_block_no(sb
, group_no
) +
824 EXT2_BLOCKS_PER_GROUP(sb
) - 1;
827 #define ext2_set_bit __test_and_set_bit_le
828 #define ext2_clear_bit __test_and_clear_bit_le
829 #define ext2_test_bit test_bit_le
830 #define ext2_find_first_zero_bit find_first_zero_bit_le
831 #define ext2_find_next_zero_bit find_next_zero_bit_le